Sound-box.



vW. W. ZAGKBY.

SOUND BOX.

ION FILED JULYes, 191a Patented Apr.

APPLIOAT W To ir-J.

.WILLLAM W. ZACKEY, 0F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR 0F FORTY-NINE ONE-HUNDREDTHS TO CHARLES B. HEWITT, OF BURLINGTON, NEW JERSEY.

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Specification of Letters Patent. Application filed July 25, 1913. SerialNo. 781,055.

Patented Apr. 7, 191a.

ful Sound-Box, of which the following is ay 7 specification.

This invention relates to sound boxes for sound recording andreproducing machines, and has for an object to provide a diaphragm andmounting therefor, whereby not onlyis the sound reproduced in adesirable volume,

' but it is also perfect in quality and tone bephragin substantiallyfloats within the box-,-

ing free from metallic, grinding or scratchingsounds. r

It has for a further object to provide a sound box-in which a portionofthe diaand .operates in conjunction with a flexible member formed of asuitableiabric whereby a sensitive and delicate means of transmittingsound waves is provided.

It has for a further object to provide a novel mounting for the stylusbar which operates 1n congunetion with the novel d1aphragm constructionto produce a balanced.

' condition which materially increases the et- I"ective action of thediaphragm in the reproduction of sounds.

It further consists of other novel ieatures of construction, all as wll. be hereinafter Jfully set forth.

. Fig. 3 represents a plan of a portionof the sound box showing detailsof the stylus bar.

For the purpose of illustrating my inven tion, I have shown in theaccompanying drawin s one form thereof which is at nos 21? V i cutpreierred by me, although it is to be un derstood that the various1nstru1nental1t1es of which my invention consists can be variouslyarranged and organized and that my invention is not hunted to theprecise arrangement and organization of these instrumentalities asherein shown and described.

Figurev 1 represents a perspective of a sound box embodying myinvention. Fig. 2 represents'a section on line to a: of Fig. 1.

mounting. Fig. drepresents side elevation of the part shown 111 Fig. 3.Flg. 5 represents a perspective, of one of the diaphragm springs.spective of one of cars.

Similar numerals of reference indicate corresponding parts in thefigures.

Referring to the drawings: The sound box embodying the principles of mynovel invention consists,

Fig. 6 represents a per the stylus bar supporting ferential flange 2thereon forming a compartment 3 from which the sound waves aredischarged through the opening 4-, preferably .disposed at substantiallythe center of the body 1. The,compartment 3 is adapted to receive. adisk 5 of mica or like material which serves with other adjuncts thepurpose of a diaphragm for the otherwise open in the present instance,of a body member 1, having an annular circumendof the body 1, and itwill be noted that v the said disk is located within and encircled bythe flange 2.

(Sdesignates a fabric preferably of sill: or material of like texture,which is stretched across the flange 2 and completely closes thecon'ipartment 3. This fabric 6, in the presentinstance, is stretchedwith drum-like tightness as shown in Fig. 2, while the disk V5 is heldin close contact with the said fabric by means of the fastening device7, which is preferably a screw threaded into the, outer bentend of thestylus bar 8. Thus the fabric member 6 and the disk 5 form t gether aflexible sensitive diaphragm capable of transmitting and reproducingsound WitVGS.

Q designates a split ring adapted to en circle the flange 2, andsecurely clamp the edges of the falu'ic (3 against the outer walls oithe flange 2. The ring 9 is provided with cars 10, and a suitableclamping bolt 11, in ordcr'to draw the ring 9 into close contact andmaintain the parts in their adjusted positions.

a The slylus'bar 8 is fixedly secured to a fastening device. It will benoted that the ears 14; are disposed in opposite relation to each other,so that one of the lugs 15 is adjacent one side of the ring 9, while theother lug is adjacent the opposite side.

. l7 designates a pair of springs preferably formed of spring wire andeach having an eye 18 arranged in oii'set relation to the body portionof the spring fora purpose which will now be described. The springs 17are respectively carried by the fastening devices 16, and the end 19 ofeach passes through an opening 20 in the spindle 12, so that the actionis to return the stylus bar 8 to its normal or neutral position, after amovement of the diaphragm members. Attention is directed to thefactthatone of the springs 17 has its offset portion turned in onedirection, while the other spring has the offset portion turned in theopposite direction, and the tension of the springs may of course beregulated by the nuts 21 of the fastening bolts 16. Thus movement of thediaphragm members in one direction is counteracted by the action of oneof the springs, and movementthereof in the opposite direction iscounteracted by the other spring, the tendency thereby being to balancethe action of the diaphragm and make it possible to transmit asuccession of sound vibrations each of which is clear, complete, and afaithful reproduction of a particular sound grooves, while the needleused in connection with the opening 22, is for use in connection withthe laterally undulating. groove. In either case the sound wave isaccurately transmitted to the diaphragm, and is reproduccd distinctly,

It will be noted that the disk 5 is in close contact'at all points withthe stretched fabric G, and is maintained entirely out of confact withthe metal of the box, thereby being free to vibrate throughout itsentire surface and providing a reproducing means which is extremelydelicate and sensitive, one which eliminates entirely any metallicsounds or scratching noises usually accompanying the reproduction ofsound Where the diaphragm is fixed .at its edges by portions of thesound box itself.

It will now be apparent that I have devised a complete unitarystructure, simple in construction, effective in operation and of such. asensitive nature as to reproduce a sound the tone quality of whichcannot be distinguishedfrom the original sound.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. In a sound recording and reproducing maehine a sound box, a diaphragmoperatively mounted therein, an arbor suitably mounted in a bearing inconstant relation with respect to said sound box and adapted for rotarymovement, a stylus bar fixedly carried by said arbor, and connected withsaid diaphragm, and independent springs suitably mounted and each actingtorsionally and axially upon the said arbor, on portions thereof on theopposite sides of said bearing, in opposed relation, and tending torotate said arbor in opposite directions.

2. In a sound recording and reproducing machine, a sound box, adiaphragm operatively mounted therein, an arbor suitably mounted in abearing in constant relation with respect to said sound box and adaptedfor rotary movement, a stylus bar fixedly carried by said arbor andconnected with said diaphragm, independent springs suitably mounted andeach acting torsionally' and axially upon the said arbor on the oppositesides of the bearing thereof in opposed relation-and tending to rotatesaid arbor in opposite directions, and means for independent adjustmentof said springs for balancing the tension thereof on said arbor.

3. In device of the character stated, a

body member having a centrally disposed opening therein, a diaphragmoperatively connected to said body member, a stylus bar connected tosaid diaphragm, a spindlesecured to said stylus bar and having anopening adjacent each end, a bearing for said spindle, a spring seatedin each opening, an eyelet on one end of each spring, oil-set therefromand oppositely disposed with respect to each other, and adjusting meansoppositely situated and passing through said eyelets for varying thetension of said springs.

4. In a sound recording and reproducing machine, a sound box, adiaphragm operatively mounted therein, an arbor, a support in which saidarbor is mounted and adapted for rotary movement, a stylus bar fixedlycarried by said arbor and connected'with said diaphragm, and means,acting torsionally directly upon said arbor in opposed relation. andtending to rotate said arbor in opposite directions to adjust the axialposition thereof and acting to maintain the same frictional engagementof said arbor with said support at all times.

5. In a sound recording and reproducing acting torsionally and axiallyupon said m.-

Ii,092,55.il

atively mounted therein, an ar ior suitably maintain the same frictionalengagementof supported. and fixedly carrying a stylus b211- said arborwith its support at all times. 1 connected with said dioploi-agm andmeans VVILLlAM W. ZACKEY.

Witnesses C. D. MGVAY H. M, LAFFERTY.

llor in opposed relation and tending to rotate machine, a sound box, adiaphragm operthe axial position thereof, aml acting to I said arbor 1nopposite directions to adjust]

